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MPG question

I'm driving my wagon on a semi-regular basis (new job is a 100 mile round trip). I forgot the average miles per tank I was getting when it was my primary car.

I might get 250 miles out of this tank with some city driving and highway driving. The car is averaging ~24-28 MPG.It's a stock 1.8 with 170,805 miles.

I feel my mileage could be better. It is easy to start when cold, but is difficult to keep a smooth idle shortly after starting. But, I digress. This is another matter I need to investigate at another time.

What do you average per tank with mixed driving?

Thanks

(sheriff)Early, I though you said this was a drug possum.
(Early) Sure, I drug him from the ditch.
(sheriff) I wish you told me that before you sold him to me.

I tend to drive ~270-280 on a full tank then fill up - trying to keep at least 1/4 tank at all times. I am averaging 28-32 depending on load and amount of stop & go. The best I've done is just over 34 w/ just my buddy and I - no extra baggage - all highway down to DC.

Vacuum leaks always tend to drop my MPG. Random tanks I got 20-22 - and immediately found a cracked hose or something. Fixed it - and back to normal the next tank.

I'm sure I can tweak a few things still - my #1 culprit being the cracked or missing o-ring at the idle adj screw.

my Fox wagon got 10 litres to the 100kms with heavy footed city driving = 23.5 mpg with no gear not even a spare tire... hwy I got 29.4 mpg but we live in the mountains and the speeds are 75 to 86 mph... hope that helps... I also cleaned my injectors in a sonic bath and found the orig injector o-rings in dire straights including vacum hoses

All of this information is useless without mention of four vs. five speed.

With my four speed and aggressive driving style I have averaged 27.7 miles per American gallon over the past 7,500 miles which is split near 50/50 city/highway. My best was 30.9 mpg on a mountainous highway trip and a worst of 24.6 which involved mostly city driving and extensive right foot testing of a small performance mod.

I figure on 300 miles in the wagon, if I run it low (I usually fill at around half a tank though.) I'm getting about 28mpg, but that's with the modifications. I think stock it was typically 30.

4-speed, of course, is standard... bah-dum-dump. With the 5-speed in my '93, I got more like 33 on average. Part of that may be due to Digifant, too. I have that tranny, and might put it in one of my CIS cars eventually, so I could compare more directly.

I filled the tank today with 10 gallons, and traveled 255 miles.
My wagon is the four speed model.
I'll see how this tank improves over the next week.

It's good to know the mileage isn't too bad. The only changes to the motor have been the dual outlet exhaust manifold, down pipe, and a WOT switch. Otherwise, all internals are stock.

try what i did and clean the charcoal canister pull it off the hoses and get a air compressor and fill it with 50Psi of air ONLY! no water or cleaners it will boost your MPG cus over the years all the fumes and dirt clog the canister and doesnt allow all the gas fumes to go back to the gas tank for combustion hope this helps i know it helped me

88' Fox sedan 4 spd~
I've been getting 30-35 mpg lately, since I bumped the timing up to 12. You may have to burn premium fuel, but I am using less fuel than before so I end up spending about the same.

When the timing was at the stock 6, which actually was 4, I was happy if I could break 30 mpg with a tail wind, at 55 mph.
And the car felt strangled, esp below 3000 rpm.

My 88 wagon was getting between 300-340mi out of a tank and I do a lot of mixed driving and use the engine. Worked out to get around 28-32 mpg usually around 30...this was all stock save for a tt catback &hiflo cat and ignition timing set to 9deg running regular fuel. I have since done a lot of engine work so I cant fully comment on that yet...JH head heavily ported &polished, ported intake, bigger tb, wot switch, 16v ecu, Dual manifold/downpipe, I HAD a TT 280/276 cam in it, just removed the cam yesterday for a G Grind because it was too radical for what I need. Last tank I got around 260 with the large cam, should be more with the G grind because I dont need to get on it as hard for normal driving. Still running 9deg ignition timing advance and it runs great has great power, I also tweaked my CIS-E and it really shows now, but If I can get the car to get 28 again id be thrilled.

Side note...I have had many CIS cars and they frequently get great fuel mileage, I had a 84 Jetta GLI I sold last year with a Elgin 272 cam...some other mods as well and it got 30mpg all day long running 14 deg ignition timing advance and 93 octane.

I changed the timing a little today. It was driving well, but I changed it to a little past 6*(degrees).
It seems to drive smoother, and doesn't slow as much going uphill.

Ever since the DPR started leaking ( four years ago!!!) on the original fuel distributor (FD), I've had more trouble with mileage than I care to think about. I finally located and installed a FD that didn't have the aluminum plug drilled out. I got it out of a CIS-e GTI. I don't think that would cause poor mileage, but I could be wrong. I picked up and installed the GTI camshaft too.

Driving the wagon 120 miles on Monday and Tuesday. I'll be interested to see how the mileage proves out.

How does the G grind cam feel compared to stock? Always wanted a drivings opinion.

Last edited by mike in SC; 10-07-2012 at 09:09 PM.
Reason: mas informacion

(sheriff)Early, I though you said this was a drug possum.
(Early) Sure, I drug him from the ditch.
(sheriff) I wish you told me that before you sold him to me.

How does the G grind cam feel compared to stock? Always wanted a drivings opinion.

Well keep in mind all at once I went from: Stock long block with a hiflo cat and a tt 2" catback to a Heavily ported and polished JH solid lifter head, ported intake manifold, bigger tb, dual exhaust manifold, dual downpipe etc. I also installed a 16v CIS-E ecu (only reason its a 16v one is because I had two spares on hand), and a wot switch that I set to switch on around 80% throttle. I then worked on getting my a/f sorted as it was obviously way too lean, and at this point its about as good as its gonna get. The only similarity between this is I am running the same base ignition timing setting I was before...the whole point of the "build" was to give the car more driveability power BUT keep it running on 87 octane because I own two other cars that require 93 due to the way I have them tuned.

As of now, the G grind cam wins all around in my book. I have the cam timing retarded 2 degrees and currently from idle-6k the car pulls very hard, mind you on conservative ignition timing. the G grind I would similarly compare to a 268 hydraulic cam, seems to have a similar power range.

Mine gets 43mpg in town and 53mpg on the highway...then again it's a diesel...lol.

I typically get to around 440 miles (in town) before I consider filling up, and typically it takes a little over 10 gallons.

I'd like to take it on an extended run in the near future, before winter sets in, and see how good it gets. I think it'll do better both in town and highway but there's a tiny fuel leak on the IP right now and I haven't picked up the o-ring I need to fix it.